/*
	pr_edict.c

	entity dictionary

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

static __attribute__ ((unused)) const char rcsid[] = 
	"$Id$";

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdarg.h>
#include <stdio.h>

#include "QF/cbuf.h"
#include "QF/crc.h"
#include "QF/cvar.h"
#include "QF/dstring.h"
#include "QF/hash.h"
#include "QF/idparse.h"
#include "QF/progs.h"
#include "QF/qdefs.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/sys.h"
#include "QF/zone.h"
#include "QF/va.h"

#include "compat.h"

/*
	ED_ClearEdict

	Sets everything to NULL
*/
void
ED_ClearEdict (progs_t *pr, edict_t *e, int val)
{
	unsigned int i;

	if (NUM_FOR_EDICT(pr,e)<*pr->reserved_edicts)
		Sys_Printf("clearing reserved edict %d\n", NUM_FOR_EDICT(pr,e));
	for (i=0; i < pr->progs->entityfields; i++)
		e->v[i].integer_var = val;
	e->free = false;
}

/*
	ED_Alloc

	Either finds a free edict, or allocates a new one.
	Try to avoid reusing an entity that was recently freed, because it
	can cause the client to think the entity morphed into something else
	instead of being removed and recreated, which can cause interpolated
	angles and bad trails.
*/
edict_t *
ED_Alloc (progs_t *pr)
{
	int         i;
	edict_t    *e;
	int         start = pr->reserved_edicts ? *pr->reserved_edicts : 0;
	int         max_edicts = pr->pr_edictareasize / pr->pr_edict_size;

	for (i = start + 1; i < *(pr)->num_edicts; i++) {
		e = EDICT_NUM (pr, i);
		// the first couple seconds of server time can involve a lot of
		// freeing and allocating, so relax the replacement policy
		if (e->free && (e->freetime < 2 || *(pr)->time - e->freetime > 0.5)) {
			ED_ClearEdict (pr, e, 0);
			return e;
		}
	}

	if (i == max_edicts) {
		Sys_Printf ("WARNING: ED_Alloc: no free edicts\n");
		i--;							// step on whatever is the last edict
		e = EDICT_NUM (pr, i);
		if (pr->unlink)
			pr->unlink (e);
	} else
		(*(pr)->num_edicts)++;
	e = EDICT_NUM (pr, i);
	ED_ClearEdict (pr, e, 0);

	return e;
}

/*
	ED_Free

	Marks the edict as free
	FIXME: walk all entities and NULL out references to this entity
*/
void
ED_Free (progs_t *pr, edict_t *ed)
{
	if (pr->unlink)
		pr->unlink (ed);				// unlink from world bsp

	if (pr_deadbeef_ents->int_val) {
		ED_ClearEdict (pr, ed, 0xdeadbeef);
	} else {
		if (pr->free_edict)
			pr->free_edict (pr, ed);
		else
			ED_ClearEdict (pr, ed, 0);
	}
	ed->free = true;
	ed->freetime = *(pr)->time;
}

//===========================================================================



void
ED_PrintNum (progs_t *pr, int ent)
{
	ED_Print (pr, EDICT_NUM (pr, ent));
}

/*
	ED_PrintEdicts

	For debugging, prints all the entities in the current server
*/
void
ED_PrintEdicts (progs_t *pr, const char *fieldval)
{
	int		i;
	int		count;
	ddef_t	*def;

	def = ED_FindField(pr, "classname");

	if (fieldval && fieldval[0] && def) {
		count = 0;
		for (i = 0; i < *(pr)->num_edicts; i++)
			if (strequal(fieldval,
						 E_GSTRING (pr, EDICT_NUM(pr, i), def->ofs))) {
				ED_PrintNum (pr, i);
				count++;
			}
		Sys_Printf ("%i entities\n", count);
	} else {
		for (i = 0; i < *(pr)->num_edicts; i++)
			ED_PrintNum (pr, i);
		Sys_Printf ("%i entities\n", *(pr)->num_edicts);
	}
}

/*
	ED_Count

	For debugging
*/
void
ED_Count (progs_t *pr)
{
	int			i;
	int			active, models, solid, step, zombie;
	ddef_t		*solid_def;
	ddef_t		*model_def;
	edict_t		*ent;

	solid_def = ED_FindField (pr, "solid");
	model_def = ED_FindField (pr, "model");
	active = models = solid = step = zombie = 0;
	for (i = 0; i < *(pr)->num_edicts; i++) {
		ent = EDICT_NUM (pr, i);
		if (ent->free) {
			if (*(pr)->time - ent->freetime <= 0.5)
				zombie++;
			continue;
		}
		active++;
		if (solid_def && ent->v[solid_def->ofs].float_var)
			solid++;
		if (model_def && ent->v[model_def->ofs].float_var)
			models++;
	}

	Sys_Printf ("num_edicts:%3i\n", *(pr)->num_edicts);
	Sys_Printf ("active    :%3i\n", active);
	Sys_Printf ("view      :%3i\n", models);
	Sys_Printf ("touch     :%3i\n", solid);
	Sys_Printf ("zombie    :%3i\n", zombie);
}

edict_t *
EDICT_NUM (progs_t *pr, int n)
{
	int offs = n * pr->pr_edict_size;
	if (offs < 0 || n >= pr->pr_edictareasize)
		PR_RunError (pr, "EDICT_NUM: bad number %i", n);
		
	return PROG_TO_EDICT (pr, offs);
}

int
NUM_FOR_BAD_EDICT (progs_t *pr, edict_t *e)
{
	int		b;

	b = (byte *) e - (byte *) * (pr)->edicts;

	if (pr->pr_edict_size)
		b /= pr->pr_edict_size;

	return b;
}

int
NUM_FOR_EDICT (progs_t *pr, edict_t *e)
{
	int		b;

	b = NUM_FOR_BAD_EDICT (pr, e);

	if (b && (b < 0 || b >= *(pr)->num_edicts))
		PR_RunError (pr, "NUM_FOR_EDICT: bad pointer %d %p %p", b, e,
					 *(pr)->edicts);

	return b;
}

qboolean
PR_EdictValid (progs_t *pr, int e)
{
	if (e < 0 || e >= pr->pr_edictareasize)
		return false;
	if (e % pr->pr_edict_size)
		return false;
	return true;
}